For the presentation of norm values, often stanines are used (standard nine). These values mark a person’s relativ position in comparison to the sample or to norm values.
According to Wikipedia:

The underlying basis for obtaining stanines is that a normal distribution is divided into nine intervals, each of which has a width of 0.5 standard deviations excluding the first and last, which are just the remainder (the tails of the distribution). The mean lies at the centre of the fifth interval.

For illustration purposes, I wanted to plot the regions of the stanine values in the standard normal distribution – here’s the result:

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This website is a conglomerate of old and new texts - some are in German, some in English. I do not have the time to translate each, so unfortunately this is a mixed-language site. I'm sorry. If you have any questions about the German texts, just write an email!
Diese Webseite ist eine Mischung aus deutschen und englischen Texten - leider habe ich nicht die Zeit sie jeweils in die andere Sprache zu übersetzen. Falls Sie Fragen zu einem englischen Text haben können Sie mir gerne eine Email schreiben!